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Sep 21, 2013
09/13

by
Hongyu He; Jerome William Hoffman

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We show that the Humbert surfaces rationally generate the Picard groups of Siegel modular threefolds.

Source: http://arxiv.org/abs/0712.3718v1

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Dec 2, 2011
12/11

by
Tom Sancton

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Topics: Adventure / thriller, Fiction, Fiction - Espionage / Thriller, Political, Thrillers, Fiction /...

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Sep 18, 2013
09/13

by
Chérif Amrouche; El-Hacene E. H Ouazar

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The aim of this article is to study a nonlinear system modeling a Non-Newtonian fluid of polymer aqueous solutions. We are interested here in the existence of weak solutions for the stationary problem in a bounded plane domain or in two-dimensional exterior domain. Due to the third order of derivatives in the non-linear term, it's difficult to obtain solution satisfying energy inequality. But with a good choice of boundary conditions, an adapt special basis and the use of the good properties of...

Source: http://arxiv.org/abs/0704.2363v1

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Sep 18, 2013
09/13

by
Nobuhiro Uekusa

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Supersymmetry breaking together by constant boundary superpotentials and by the O'Raifeartaigh model is studied in a warped space model. It is shown that the contribution of constant boundary superpotentials enables the moduli of chiral supermultiplets to be stabilized and that the vacuum at the stationary point has zero cosmological constant in a wide region of parameters.

Source: http://arxiv.org/abs/0704.2490v3

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Sep 18, 2013
09/13

by
R. Thomas; T. Hilger; B. Kampfer

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The in-medium behavior of the nucleon spectral density including self-energies is revisited within the framework of QCD sum rules. Special emphasis is given to the density dependence of four-quark condensates. A complete catalog of four-quark condensates is presented and relations among them are derived. Generic differences of such four-quark condensates occurring in QCD sum rules for light baryons and light vector mesons are discussed.

Source: http://arxiv.org/abs/0704.3004v2

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Sep 18, 2013
09/13

by
Jean-Luc Lehners; Paul Smyth; K. S. Stelle

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We consider Z_2-symmetric braneworlds arising from 5-sphere compactifications with 5-form flux in type IIB supergravity. This Kaluza-Klein reduction produces a D=5 theory which supports 1/2-supersymmetric Z_2-symmetric domain-wall solutions. However, upon lifting such solutions back to D=10, one finds that supersymmetry is broken by 5-sphere Kaluza-Klein effects. This happens owing to the action on the Killing spinor of the Z_2 \subset SO(1,9) symmetry, which requires an orientation-reversing...

Source: http://arxiv.org/abs/0704.3343v2

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Sep 18, 2013
09/13

by
Biplob Bhattacherjee; Anirban Kundu

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The Kaluza-Klein excitations of the Higgs bosons of the universal extra dimension model are extremely challenging to detect. We discuss the production and possible detection mechanisms of such excited scalars at the LHC. The dominant production mechanism of such scalars is from the decay of the excited third generation quarks. In particular, the charged Higgs boson has a large production cross-section over most of the parameter space. We highlight how one may detect these excited scalars. We...

Source: http://arxiv.org/abs/0704.3340v2

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Sep 18, 2013
09/13

by
Jerome Martin

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This pedagogical review aims at presenting the fundamental aspects of the theory of inflationary cosmological perturbations of quantum-mechanical origin. The analogy with the well-known Schwinger effect is discussed in detail and a systematic comparison of the two physical phenomena is carried out. In particular, it is demonstrated that the two underlying formalisms differ only up to an irrelevant canonical transformation. Hence, the basic physical mechanisms at play are similar in both cases...

Source: http://arxiv.org/abs/0704.3540v1

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Sep 18, 2013
09/13

by
E. O. Kahya; R. P. Woodard

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We propose a generic test for models in which gravity is modified to do away with dark matter. These models tend to have gravitons couple to a different metric than ordinary matter. A strong test of such models comes from comparing the arrival time of the gravitational wave pulse from a cosmological event such as a supernova with the arrival times of the associated pulses of neutrinos and photons. For SN 1987a we show that the gravity wave would have arrived 5.3 days after the neutrino pulse.

Source: http://arxiv.org/abs/0705.0153v1

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Sep 18, 2013
09/13

by
Joohyung Kim

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Let $\Gamma$ denote a $Q$-polynomial distance-regular graph with diameter $D \geq 3$ and standard module $V$. Recently Ito and Terwilliger introduced four direct sum decompositions of $V$; we call these the $(\mu,\nu)$--{\it split decompositions} of $V$, where $\mu, \nu \in \lbrace \downarrow, \uparrow \rbrace$. In this paper we show that the ($\downarrow,\downarrow$)--split decomposition and the ($\uparrow,\uparrow$)--split decomposition are dual with respect to the standard Hermitian form on...

Source: http://arxiv.org/abs/0705.0167v1

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Sep 18, 2013
09/13

by
David Sanchez; Charles Gould; Georg Schmidt; Laurens W. Molenkamp

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We investigate electronic transport through II-VI semiconductor resonant tunneling structures containing diluted magnetic impurities. Due to the exchange interaction between the conduction electrons and the impurities, there arises a giant Zeeman splitting in the presence of a moderately low magnetic field. As a consequence, when the quantum well is magnetically doped the current-voltage characteristics shows two peaks corresponding to transport for each spin channel. This behavior is...

Source: http://arxiv.org/abs/0705.0237v1

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Sep 18, 2013
09/13

by
Elcio Abdalla; Bin Wang

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We argue that Dark Matter can be described by an interacting field theory with a mass parameter of the order of the proton mass and an interaction coupling of the order of the QED coupling.

Source: http://arxiv.org/abs/0705.0268v1

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Sep 18, 2013
09/13

by
Umberto Zannier

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Let $g(x)$ be a fixed non-constant complex polynomial. It was conjectured by Schinzel that if $g(h(x))$ has boundedly many terms, then $h(x)\in \C[x]$ must also have boundedly many terms. Solving an older conjecture raised by R\'enyi and by Erd\"os, Schinzel had proved this in the special cases $g(x)=x^d$; however that method does not extend to the general case. Here we prove the full Schinzel's conjecture (actually in sharper form) by a completely different method. Simultaneously we...

Source: http://arxiv.org/abs/0705.0911v1

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Sep 18, 2013
09/13

by
H. Korhonen; K. Brogaard; K. Holhjem; S. Ramstedt; J. Rantala; C. C. Thoene; K. Vida

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Magnetic activity in the photosphere and chromosphere of the M dwarf EY Dra is studied and possible correlations between the two are investigated using photometric observations in the V and R bands and optical and near infrared spectroscopy. The longitudinal spot configuration in the photosphere is obtained from the V band photometry, and the chromospheric structures are investigated using variations in the H alpha line profile and observations of the Paschen beta line. The shape of the V band...

Source: http://arxiv.org/abs/0705.0919v1

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Sep 18, 2013
09/13

by
G. Poggiaspalla; J. H. Lowenstein; F. Vivaldi

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We consider the restriction of interval exchange transformations to algebraic number fields, which leads to maps on lattices. We characterize renormalizability arithmetically, and study its relationships with a geometrical quantity that we call the drift vector. We exhibit some examples of renormalizable interval exchange maps with zero and non-zero drift vector, and carry out some investigations of their properties. In particular, we look for evidence of the finite decomposition property: each...

Source: http://arxiv.org/abs/0705.1073v1

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Sep 18, 2013
09/13

by
Jarmo Hietarinta; Claude Viallet

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We analyze the factorization process for lattice maps, searching for integrable cases. The maps were assumed to be at most quadratic in the dependent variables, and we required minimal factorization (one linear factor) after 2 steps of iteration. The results were then classified using algebraic entropy. Some new models with polynomial growth (strongly associated with integrability) were found. One of them is a nonsymmetric generalization of the homogeneous quadratic maps associated with KdV...

Source: http://arxiv.org/abs/0705.1903v2

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Sep 18, 2013
09/13

by
P. Tsalmantza; M. Kontizas; C. A. L. Bailer-Jones; B. Rocca-Volmerange; R. Korakitis; E. Kontizas; E. Livanou; A. Dapergolas; I. Bellas-Velidis; A. Vallenari; M. Fioc

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Aims:The Gaia astrometric survey mission will, as a consequence of its scanning law, obtain low resolution optical (330-1000 nm) spectrophotometry of several million unresolved galaxies brighter than V=22. We present the first steps in a project to design and implement a classification system for these data. The goal is both to determine morphological classes and to estimate intrinsic astrophysical parameters via synthetic templates. Here we describe (1) a new library of synthetic galaxy...

Source: http://arxiv.org/abs/0705.2152v2

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Sep 18, 2013
09/13

by
Wei Dai; Brian Rider; Youjian Liu

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The Grassmann manifold G_{n,p}(L) is the set of all p-dimensional planes (through the origin) in the n-dimensional Euclidean space L^{n}, where L is either R or C. This paper considers an unequal dimensional quantization in which a source in G_{n,p}(L) is quantized through a code in G_{n,q}(L), where p and q are not necessarily the same. It is different from most works in literature where p\equiv q. The analysis for unequal dimensional quantization is based on the volume of a metric ball in...

Source: http://arxiv.org/abs/0705.2278v1

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Sep 18, 2013
09/13

by
Hyesung Kang; T. W. Jones

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Using an improved version of the previously introduced CRASH (Cosmic Ray Acceleration SHock) code, we have calculated the time evolution of cosmic-ray (CR) modified quasi-parallel plane shocks for Bohm-like diffusion, including self-consistent models of Alfven wave drift and dissipation, along with thermal leakage injection of CRs. The new simulations follow evolution of the CR distribution to much higher energies than our previous study, providing a better examination of evolutionary and...

Source: http://arxiv.org/abs/0705.3274v1

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Sep 18, 2013
09/13

by
B. Sathiapalan

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The exact renormalization group is applied to the world sheet theory describing bosonic open string backgrounds to obtain the equations of motion for the fields of the open string. Using loop variable techniques the equations can be constructed to be gauge invariant. Furthermore they are valid off the (free) mass shell. This requires keeping a finite cutoff. Thus we have the interesting situation of a scale invariant world sheet theory with a finite world sheet cutoff. This is possible because...

Source: http://arxiv.org/abs/0705.3292v1

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Sep 18, 2013
09/13

by
Alex D. Gottlieb; Thorsten Schumm

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We investigate pair correlations in trapped fermion and boson gases as a means to probe the quantum states producing the density fluctuations. We point out that "opposite sign correlations" (meaning pair correlations that are positive for fermions and negative for bosons) unambiguously indicate that the quantum many-particle state cannot be "free." In particular, a system of fermions that exhibits positive pair correlations cannot be described by any Slater determinant...

Source: http://arxiv.org/abs/0705.3491v1

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Sep 18, 2013
09/13

by
Eugene Golowich; JoAnne Hewett; Sandip Pakvasa; Alexey A. Petrov

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We provide a comprehensive, up-to-date analysis of possible New Physics contributions to the mass difference $\Delta M_D$ in $D^0$-${\bar D}^0$ mixing. We consider the most general low energy effective Hamiltonian and include leading order QCD running of effective operators. We then explore an extensive list of possible New Physics models that can generate these operators, which we organize as including Extra Fermions, Extra Gauge Bosons, Extra Scalars, Extra Space Dimensions and Extra...

Source: http://arxiv.org/abs/0705.3650v2

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Sep 18, 2013
09/13

by
S. C. Chapman; J. Penarrubia; R. Ibata; A. McConnachie; N. Martin; M. Irwin; A. Blain; G. F. Lewis; B. Letarte; K. Lo; A. Ludlow; K. O'neil

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We present spectroscopic observations of the AndXII dwarf spheroidal galaxy using DEIMOS/Keck-II, showing it to be moving rapidly through the Local Group (-556 km/s heliocentric velocity, -281 km/s relative to Andromeda from the MW), falling into the Local Group from ~115 kpc beyond Andromeda's nucleus. AndXII therefore represents a dwarf galaxy plausibly falling into the Local Group for the first time, and never having experienced a dense galactic environment. From Green Bank Telescope...

Source: http://arxiv.org/abs/0705.4113v1

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Sep 18, 2013
09/13

by
Katrin Gelfert; Christian Wolf

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For a class of one-dimensional holomorphic maps f of the Riemann sphere we prove that for a wide class of potentials h the topological pressure is entirely determined by the values of h on the repelling periodic points of f. This is a version of a classical result of Bowen for hyperbolic diffeomorphisms in the holomorphic non-uniformly hyperbolic setting.

Source: http://arxiv.org/abs/0705.4572v1

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Sep 18, 2013
09/13

by
A. G. Beda; V. B. Brudanin; E. V. Demidova; V. G. Egorov; M. G. Gavrilov; M. V. Shirchenko; A. S. Starostin; Ts. Vylov

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The first result of the neutrino magnetic moment measurement at the Kalininskaya Nuclear Power Plant (KNPP) with the GEMMA spectrometer is presented. An antineutrino-electron scattering is investigated. A high-purity germanium detector of 1.5 kg placed 13.9 m away from the 3 GW reactor core is used in the spectrometer. The antineutrino flux is $2.73\times 10^{13} \nu_e / cm^2 / s$. The differential method is used to extract the $\nu$-e electromagnetic scattering events. The scattered electron...

Source: http://arxiv.org/abs/0705.4576v1

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Sep 18, 2013
09/13

by
T. M. Aliev; A. S. Cornell; Naveen Gaur

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In the present work we study the effects of an unparticle $\unpart$ as the possible source of missing energy in the decay $B \to K (K^*) + {\rm missing energy}$. We find that the dependence of the differential branching ratio on the $K$($K^*$)-meson's energy in the presence of the vector unparticle operators is very distinctive from that of the SM. Moreover, in using the existing upper bound on $B \to K (K^*) + {\rm missing energy}$ decays, we have been able to put more stringent constraints on...

Source: http://arxiv.org/abs/0705.4542v1

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Sep 21, 2013
09/13

by
G. Felder; X. Tang

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Let $G$ be a compact Lie group acting on a compact complex manifold $M$. We prove a trace density formula for the $G$-Lefschetz number of a differential operator on $M$. We generalize Engeli and Felder's recent results to orbifolds.

Source: http://arxiv.org/abs/0706.1021v1

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Sep 21, 2013
09/13

by
Oguz C. Durumeric

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The thickness, NIR(K) of a knot or link K is defined to be the radius of the largest solid tube one can put around the curve without any self intersections, which is also known as the normal injectivity radius of K. For C^{1,1} curves K, NIR(K)=min{(1/2)DCSC(K),(1/(supkappa(K))))}, where kappa(K) is the generalized curvature, and the double critical self distance DCSD(K) is the shortest length of the segments perpendicular to K at both end points. The knots and links in ideal shapes (or tight...

Source: http://arxiv.org/abs/0706.1037v1

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Sep 21, 2013
09/13

by
R. Bernabei; P. Belli; F. Montecchia; F. Nozzoli; F. Cappella; A. Incicchitti; D. Prosperi; R. Cerulli; C. J. Dai; H. L. He; H. H. Kuang; J. M. Ma; X. D. Sheng; Z. P. Ye

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The effect pointed out by A. B. Migdal in the 40's (hereafter named Migdal effect) has so far been usually neglected in the direct searches for WIMP Dark Matter candidates. This effect consists in the ionization and the excitation of bound atomic electrons induced by the recoiling atomic nucleus. In the present paper the related theoretical arguments are developed and some consequences of the proper accounting for this effect are discussed by some examples of practical interest.

Source: http://arxiv.org/abs/0706.1421v1

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Sep 21, 2013
09/13

by
Patrick Weber

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This works reports on gaseous detectors developments made in the frame of the EXO double-beta decay experiment. LEM (Large Electron Multiplication) are electron amplification grids based on GEM. They were developed in Neuchatel and showed remarquable resistance to sparks. The new SILEM grid combines the properties of the standard LEM with a micropatterned x-y readout plane on one of the grid side. It allows thus the amplification of the primary electrons and their position determination in the...

Source: http://arxiv.org/abs/0706.1428v1

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Sep 21, 2013
09/13

by
F. Anghinolfi

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A scintillating fibre tracker is proposed to measure elastic proton scattering at very small angles in the ATLAS experiment at CERN. The tracker will be located in so-called Roman Pot units at a distance of 240 m on each side of the ATLAS interaction point. An initial validation of the design choices was achieved in a beam test at DESY in a relatively low energy electron beam and using slow off-the-shelf electronics. Here we report on the results from a second beam test experiment carried out...

Source: http://arxiv.org/abs/0706.3316v1

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Sep 21, 2013
09/13

by
The BABAR Collaboration; B. Aubert et al

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We present measurements of the branching fractions for B0 meson decays to eta'K0 and omegaK0, and of the branching fractions and CP-violation charge asymmetries for B+ meson decays to etapi+, etaK+, eta'pi+, eta'K+, omegapi+, and omegaK+. The data, collected with the BABAR detector at the Stanford Linear Accelerator Center, represent 383 million BBbar pairs produced in e+e- annihilation. The measurements agree with previous results; we find no evidence for direct CP violation.

Source: http://arxiv.org/abs/0706.3893v3

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Sep 21, 2013
09/13

by
H. Oti-Floranes; J. M. Mas-Hesse

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The study of massive star formation needs some basic tools, among which reliable SFR tracers are crucial ones. We are presently revising the calibration of SFR tracers at different wavelength ranges using last generation evolutionary population synthesis codes. The FIR luminosity produced by the heated dust in star forming regions is commonly used to characterize a starburst. The X-ray luminosity has been found to show a narrow correlation with it, and therefore it has been proposed as an...

Source: http://arxiv.org/abs/0706.3826v1

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Sep 18, 2013
09/13

by
M. F. Gelin; D. S. Kosov

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In order to adequately describe molecular rotation far from equilibrium, we have generalized the J-diffusion model by allowing the rotational relaxation rate to be angular momentum dependent. The calculated nonequilibrium rotational correlation functions (CFs) are shown to decay much slower than their equilibrium counterparts, and orientational CFs of hot molecules exhibit coherent behavior, which persists for several rotational periods. As distinct from the results of standard theories,...

Source: http://arxiv.org/abs/0707.0139v1

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Sep 18, 2013
09/13

by
I. A. Dmitriev; A. D. Mirlin; D. G. Polyakov

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We develop a systematic theory of microwave-induced oscillations in magnetoresistivity of a 2D electron gas in the vicinity of fractional harmonics of the cyclotron resonance, observed in recent experiments. We show that in the limit of well-separated Landau levels the effect is dominated by a change of the distribution function induced by multiphoton processes. At moderate magnetic field, a single-photon mechanism originating from the microwave-induced sidebands in the density of states of...

Source: http://arxiv.org/abs/0707.0990v2

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Sep 18, 2013
09/13

by
Mikolaj Korzynski

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A new definition of quasi--local angular momentum of non--axisymmetric marginally outer trapped surfaces is proposed. It is based on conformal decomposition of the two--dimensional metric and the action of the group of conformal symmetries. The definition is completely general and agrees with the standard one in axi--symmetric surfaces.

Source: http://arxiv.org/abs/0707.2824v4

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Sep 18, 2013
09/13

by
Athanasios N. Chantis; Kirill D. Belashchenko; Darryl L. Smith; Evgeny Y. Tsymbal; Mark van Schilfgaarde; Robert C. Albers

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A minority-spin resonant state at the Fe/GaAs(001) interface is predicted to reverse the spin polarization with voltage bias of electrons transmitted across this interface. Using a Green's function approach within the local spin density approximation we calculate spin-dependent current in a Fe/GaAs/Cu tunnel junction as a function of applied bias voltage. We find a change in sign of the spin polarization of tunneling electrons with bias voltage due to the interface minority-spin resonance. This...

Source: http://arxiv.org/abs/0707.3644v1

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Sep 18, 2013
09/13

by
M. Yu. Kalmykov; B. F. L. Ward; S. A. Yost

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We continue the study of the construction of analytical coefficients of the epsilon-expansion of hypergeometric functions and their connection with Feynman diagrams. In this paper, we show the following results: Theorem A: The multiple (inverse) binomial sums of arbitrary weight and depth (see Eq. (1.1)) are expressible in terms of Remiddi-Vermaseren functions. Theorem B: The epsilon expansion of a hypergeometric function with one half-integer value of parameter (see Eq. (1.2)) is expressible...

Source: http://arxiv.org/abs/0707.3654v3

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Sep 19, 2013
09/13

by
I. C. Arsene; L. Bravina; A. B. Kaidalov; K. Tywoniuk; E. Zabrodin

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We present predictions for heavy-quark production for proton-lead collisions at LHC energy 5.5 TeV from Glauber-Gribov theory of nuclear shadowing. We have also made predictions for baseline cold-matter (in other words inital-state) nuclear effects in lead-lead collisions at the same energy that has to be taken into account to understand properly final-state effects.

Source: http://arxiv.org/abs/0708.3801v1

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Sep 19, 2013
09/13

by
Nikolai Mnev

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With a compact PL manifold X we associate a category T(X). The objects of T(X) are all combinatorial manifolds of type X, and morphisms are combinatorial assemblies. We prove that the homotopy equivalence BT (X) \approx BPL(X) holds, where PL(X) is the simplicial group of PL-homeomorphisms. Thus the space BT(X) is a canonical countable (as a CW-complex) model of BPL(X). As a result, we obtain functorial pure combinatorial models for PL fiber bundles with fiber X and a PL polyhedron B as the...

Source: http://arxiv.org/abs/0708.4039v3

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Sep 19, 2013
09/13

by
Florian Bürzle; Peter Nielaba

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Two-dimensional melting transitions for model colloids in presence of a one-dimensional external periodic potential are investigated using Monte Carlo simulation and Finite Size Scaling techniques. Here we explore a hard disk system with commensurability ratio $p=\sqrt{3}a_s/(2d)=2$, where $a_s$ is the mean distance between the disks and $d$ the period of the external potential. Three phases, the modulate liquid, the locked smectic and the locked floating solid are observed, in agreement with...

Source: http://arxiv.org/abs/0708.4203v2

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Sep 19, 2013
09/13

by
Eiji Nakano; Muneto Nitta; Taeko Matsuura

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The most fundamental strings in high density color superconductivity are the non-Abelian semi-superfluid strings which have color gauge flux tube but behave as superfluid vortices in the energetic point of view. We show that in addition to the usual translational zero modes, these vortices have normalizable orientational zero modes in the internal space, associated with the color-flavor locking symmetry broken in the presence of the strings. The interaction among two parallel non-Abelian...

Source: http://arxiv.org/abs/0708.4096v1

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Sep 19, 2013
09/13

by
Paul Biran; Octav Cornea

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We discuss various algebraic quantum structures associated to monotone Lagrangian submanifolds and we present a number of applications, computations and examples.

Source: http://arxiv.org/abs/0708.4221v1

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Sep 19, 2013
09/13

by
Sergei Sergeenkov

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Using a 2D model of capacitively coupled Josephson junction arrays (created by a network of twin boundary dislocations with strain fields acting as an insulating barrier between hole-rich domains in underdoped crystals), we study the influence of chemical pressure on nonlinear thermal conductivity (NLTC) of an intrinsically granular superconductor. Quite a substantial enhancement of NLTC is predicted when intrinsic chemoelectric field closely matches the externally produced thermoelectric...

Source: http://arxiv.org/abs/0708.4210v1

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Sep 19, 2013
09/13

by
Bom Soo Kim

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We construct a sigma model in two dimensions with Galilean symmetry in flat target space similar to the sigma model of the critical string theory with Lorentz symmetry in 10 flat spacetime dimensions. This is motivated by the works of Gomis and Ooguri\cite{Gomis:2000bd} and Danielsson et. al. \cite{Danielsson:2000gi, Danielsson:2000mu}. Our theory is much simpler than their theory and does not assume a compact coordinate. This non-relativistic string theory has a bosonic matter $\beta\gamma$...

Source: http://arxiv.org/abs/0708.4261v2

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Sep 21, 2013
09/13

by
Szabolcs Mike; J. Doyne Farmer

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We develop a behavioral model for liquidity and volatility based on empirical regularities in trading order flow in the London Stock Exchange. This can be viewed as a very simple agent based model in which all components of the model are validated against real data. Our empirical studies of order flow uncover several interesting regularities in the way trading orders are placed and cancelled. The resulting simple model of order flow is used to simulate price formation under a continuous double...

Source: http://arxiv.org/abs/0709.0159v1

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Sep 21, 2013
09/13

by
Roberto A. Sussman

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We examine numerically and qualitatively the Lema\^\i tre--Tolman--Bondi (LTB) inhomogeneous dust solutions as a 3--dimensional dynamical system characterized by six critical points. One of the coordinates of the phase space is an average density parameter, $ $, which behaves as the ordinary $\Omega$ in Friedman-Lema\^\i tre--Robertson--Walker (FLRW) dust spacetimes. The other two coordinates, a shear parameter and a density contrast function, convey the effects of inhomogeneity. As long as...

Source: http://arxiv.org/abs/0709.1005v2

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51

Sep 21, 2013
09/13

by
Olga K. Sil'chenko

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Panoramic spectroscopic data of the sample of 80 nearby lenticular galaxies obtained with the Multi-Pupil Fiber Spectrograph of the 6-m telescope are presented. The SSP-equivalent ages, [Z/H], and [Mg/Fe] are determined through the Lick indices H-beta, Mgb, and separately for the nuclei and for the bulges. About a half of the sample contain chemically distinct nuclei, more metal-rich and younger than the bulges. The correlations of the stellar population properties for the nearby S0s are...

Source: http://arxiv.org/abs/0709.2928v1

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Sep 21, 2013
09/13

by
G. H. A. Roelofs; G. Nelemans; P. J. Groot

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The AM Canum Venaticorum stars are rare interacting white dwarf binaries, whose formation and evolution are still poorly known. The Sloan Digital Sky Survey provides, for the first time, a sample of 6 AM CVn stars (out of a total population of 18) that is sufficiently homogeneous that we can start to study the population in some detail. We use the Sloan sample to `calibrate' theoretical population synthesis models for the space density of AM CVn stars. We consider optimistic and pessimistic...

Source: http://arxiv.org/abs/0709.2951v1

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Sep 21, 2013
09/13

by
F. Rahaman; M. Kalam; K. A. Rahman

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Some new class of Chaplygin wormholes are investigated in the framework of a Chaplygin gas with equation of state $ p = - \frac{A}{\rho}$, $A>0$. Since empty spacetime ($ p = \rho = 0 $) does not follow Chaplygin gas, so the interior Chaplygin wormhole solutions will never asymptotically flat. For this reason, we have to match our interior wormhole solution with an exterior vacuum solution i.e. Schwarzschild solution at some junction interface, say $ r = a $. We also discuss the total amount...

Source: http://arxiv.org/abs/0709.3162v1